Python (day2)-string (2)

String formatting:

A string format method is mentioned earlier to review:

Print (' Hisname was%s'Jeff ' is%s ' Jeff

In fact, there are more than one format method:

Print ('{0}, {1}'. Format ('Alex','  33

The following values are sorted in order. But it doesn't seem so intuitive to improve

Print ('{name},{age}'. Format (name='Jeff', age='23  ') Jeff,23

This is not very intuitive, the corresponding relationship at a glance

Print ('%-10s%-10s%-10s' % ('name','age' ,'job')) name      age       Job

%-10s Knot string 10 Characters of space, in the alignment of the output is very useful oh.

Here's a look at the string method:

' Jeff '>>> name. __contains__ ('ff')    # ' FF ' is contained in name True

>>> name.capitalize ()#Capitalize first letter'Jeff'>>> Name.center (20)#Center within 20 character spaces'Jeff'>>> Name.center (20,'*')#You can customize the center'********jeff********'>>> Name.count ('F')#Count2>>> Name.count ('F', 0,2)#count in slices0>>> Name.count ('F', 0,3)1>>> Name.endswith ('F')#judging not to end with FTrue>>> Name.endswith ('e', 0,2)#Judging in slicesTrue>>> name ='J\teff'>>> Name.expandtabs ()#Displays the escape character in the string, \ t is the tab'J Eff'>>> Name.index ('F')#return index value3>>> Name.find ('ex')#return index value, not found return-1-1>>> Name.find ('FF')#R Returns an index, the first matching3>>> Name.index ('x')#An exception is thrown when the index method is not foundTraceback (most recent): File"<stdin>", Line 1,inch<module>valueerror:substring notfound>>>

>>> name ='Jeff'>>> Name.isdigit ()#whether it is a numeric number, note that negative numbers also return false-oh, positive integers and 0 return trueFalse>>> Name.isalnum ()#are they all letters or numbers?True>>> Name.isalpha ()#are they all letters?True>>> Name.isdecimal ()#whether it is a decimal decimalFalse>>> Name.isidentifier ()#Judging whether a string is legal, is actually judging whether the variable is legitimateTrue>>> Name.islower ()#are they all lowercase?True>>> Name.isupper ()#are they all uppercase?False>>> Name.isnumeric ()#whether it is a numberFalse>>> Name.isspace ()#whether it is a spaceFalse>>> Name.istitle ()#whether it is a titleFalse

Join () method

>>> li = ['a','b','C' ,'d']'_'. Join (LI)  'a_b_c_d'

Strip () method: Remove the left and right side of the space, newline characters will be removed oh.

>>>'name'. Strip ()'name'>>>'name'. Strip ()'name'>>>'name\n'. Strip ()'name'>>>'\nname\n'. Strip ()'name'

Lstrip (): Remove the Left

Rstrip (): Remove the right

Look at the following.

 >>> intab =  " aeiou   " >>> Outtab = "  12345   " >>> from  string import   Maketrans  >>> trantab = Maketrans (inta B,outtab) #  python3 here will throw an exception do not know why  >> > str =  " this is string example.....wow!!   " >>> print   Str.translate (trantab) th3s 3s str3ng 2x1mpl2.....w4w!!  

print str.translate (trantab,'xm')   # replaced by mapping, and moved out of X and Mth3s 3s str3ng 21pl2.....w4w!!

Go ahead, look at a segmentation method

' JACKISPPP '>>> name.partition (' is') ('Jack')  ' is''PPP')

Peplace () Replace

 >>> name =  " jack is teacher " Span style= "COLOR: #800000" > " >>> name.replace ("  a  " ,  " x  "  ) #将所有a替换成x  Span style= "COLOR: #800000" > " jxck is Texcher   " 

>>> name.replace ('C','T', 2)   #替换两个 ' Jatk is TeaTher '

Split ()

Splitlines ()

StartsWith ()

Swapcase () Case Conversion

Title () converted to caption

Upper () turn into uppercase

Python (day2)-string (2)